Use-after-free in Linux kernel - CVE-2026-72234

Vulnerability identifier: #VU143357

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-72234

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use-after-free in net/batman-adv/routing.c when processing batman-adv unicast packets. A local user can send a specially crafted packet to cause a denial of service.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-gcp (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 7.0.0-34.34, 7.0.0-34.34.1, 7.0.0-34.34~24.04.1, 7.0.0-1012.12~24.04.1, 7.0.0-1013.13, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1020.20
linux-gcp (Ubuntu package) - addressed in versions 7.0.0-1013.13, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14

• https://git.kernel.org/stable/c/7141990add3f75436f2933cb310654cad3b1e3e9
• https://git.kernel.org/stable/c/7b162b36de750565404cd3b98315706622c6974f
• https://git.kernel.org/stable/c/979175834a699ccc3c4c0b0ba60ecae0f135a587
• https://git.kernel.org/stable/c/9a7b7248798123efbd5fafe58461d57c7cc718af
• https://git.kernel.org/stable/c/9c2c05629e46c1fd43931506d41c56a885a98eb4
• https://git.kernel.org/stable/c/aa9558af859934f24717d4bab97d61004f91a736
• https://git.kernel.org/stable/c/b8afcf799b2cc92c41beebd029e53ed18960184a
• https://git.kernel.org/stable/c/ed90eb5c68420cdfe67ec1f773324198d2ef6f50

• Use-after-free in Linux kernel batman-adv
• Ubuntu update for linux-gcp
• Ubuntu update for linux